Moving-picture machine



Oct. 6

H. F. BURK ET AL MOVING PICTURE MACHINE 1923 2 Sheets-Sheet 1 Filed Nov` 14 x m In n A 7 7 l ET AL H. F. BURK MOVING PICTURE MACHINE Oct. 6, l925- Filed Nov. 14 1925 2 Sheets-Sheet 2 Patented Oct. 6, 1925.

UNITED STATES 1,555,828 PATENT OFFICE.

HARRY F. BURR AND GUSTAF W. GUSTAFSON, F BURLINGTON, IOWA.

MovInG-mcrunn MACHINE.

Application led November 14, 1923. Serial No. 674,693.

To all whom. it 'may concern:

Be it known that Wel-Ianni F. Brun and GUSTAF W. GUs'rAFsoN, citizens of the Fnited States, residing at Burlington. in the count).v of Des Moines and State of Iowa. have invented certain new and useful Improvements in Moving-Picture .\lachines. ot which the following is a specification'.

This invention relates to a. moving picture machine more particularly to the shutter and the object of our invention is to gain greater percentage of light without producing the dicker in the picture which heretofore has been eliminated at the sacrifice of a more intense light.

Another object o our invention is to use as small a blade as possible with enact amount of current being used relative to a certain speed of the machine.

Another object of our invention is to arrange an automatic blade which is governed by the speed of the shutter, the resistance of the blade to the air determining its position.

In the accompanying drawings:

Figure 1 is a plan view of the shutter;

Fig. 2 is a transverse sect-ion of the shutter;

Fig. 3 is a rear plan vieu' of the shutter;

Fig. 4 is a detail perspective vienv ot one of the blades; and

Fig. 5 is an enlarged transverse section through the hub of the shutter.

The numeral 1 indicates an`annular rim to which is attached a segmental blade 2. which terminates centrally of the rim and is provided with a hub 3. Secured to the opposite sides ofthe hub of the blade 2- are Washers 11 and 5. The numeral 6 indicates a segmental blade. the hub otwhich has an opening of sulflicientV diameter to receive the Washer 5. The outer end of this blade 6 is received in an annular groove 'T in the rim 1, the blade being adjustable Within the annularl groove 7, the blade being of such a thickness as to be adjustable manually in the groove and remain in its adjusted position. The numeral 8 indi- Cates a supporting rib integral with the rim 1 adapted to extend inwardly to the I center of the rim and is provided with a hub 9 to which is attached the bearing 10 ot the shutter. Arranged upon the blade 2 is a movable blade 11 rotatably mounted upon the Washer 4, bolts 12 passing through suitable openings in the hub 9 integral with the member 8. thence through the blade .3 and the Washers et and 5 arranged on the opposite side of' the blade receiving nuts which secure the several parts together, the bolts 12 receiving uponthe outer ends thereof a Washer 13 spaced from the blade 1l and a spiral spring 11 is adapted to pass around the screuv bolts 12. One end of this spring is secured to the blade 11 and the opposite end 15 engages one edge ot the blade 6. This blade 11 is provided with detlector ivings 16 which as the shutter is rotated offer a certain resistance to the air against the tension of the spring 14. 1n this manner the blade 1l is moved to or from the member 6. The spring 14 tends to move the blade in a counter clock-Wise direction, the shutter being adapted to move in a clock-Wise direction.

As stated, the blade 6 is manually adjustable in the initial starting of the shutter. Should there be any flicker on the screen it could be overcome by either moving the. blade 6 toward blade 2 or blade 11. erally it is plausible to move it toward blade 2. This blade 6 is set to operate correctly on any amperage or speed from 100 amps. down to 20 or 25 and from 100 revolutions per minute to revolutions. Then the blade 6 is set by the operator it Will hardly need be set again as he uses nearly the same. amperage all the time but it may be changed to a larger amperage it desired. Should any Flicker occur. blade 6 can be moved toward the lett to the blade 2. "it no tlicker appears this blade 6 should be moved to the right toward blade 11 until a bit of flicker appears. Then move blade 6 toward the left toward blade 2 about one sixteenth of an .inch and it will be exact because blade 11 Working as a governor with tan blades, makes the blades come together as the machine runs faster. and spread apart the blades 6 and 11 when the machine runs slower. In this manner the inclination of the machine to flicker is automatically eliminated according to the speed of the machine.

We claim:

1. A shutter adapted to be mounted upon a shaft, consisting ofan annular rim. a fixed blade carried by said rim provided 'with a hub centrally 'of said rim. a blade movable about its axis mounted upon the hub ot the first mentioned blade. a blade movable about its axis mounted on the op- Genposite side of the hub of the first mentioned` blade provided with air deflectors and a tension spring secured .to said blade adapted` a hub having a plurality of annular grooves,

a blade movable about its axis mounted in one of said ooves, the outer end of which is received 1n an annular groove in said rim, an auxiliary movable blade mounted in the other of said groovesof the hub, a tension spring carried by the last mentioned blade and contacting with the first mentioned movable blade and air defiectors carriedby the last mentioned blade for effecting a movement of the last mentioned blade relative to the first mentioned blade.

3. The combination with a rotary shaft of a moving picture machine, a bushing mounted' upon said shaft, a fixed blade se cured to said bushing, an annular rim mounted upon the outer periphery of said fixed blade, said rim being provided with an annular groove, washers secured to either 'side of the hub of said fixed blade, a movable blade mounted upon one of said washers, its outer end received in said annular groove of the rim and capable of adjustment and a rotatable blade mounted upon the opposite washers of said first mentioned blade,

a s ring secured to said last mentioned 5 bla e, the opposite end of which engages the second. mentioned blade and air deflectors arranged on the last mentioned blades whereby the last mentioned blade is A moved relative to the other blades as the shutter is rotated.

4f. A shutter adapted to be mounted upon a shaft, comprising a bushingl keyed to said shaft, a fixed blade secured to .said bushing, an annular rim secured to the peripher of said fixed blade, a plurality of movab e blades carried by said fixed blade. an annular groove in said rim 'adapted to receive the outer end of said movable blade, a movable blade mounted for rotation upon said fixed blade and cally opposite air eflectors and a s ring attached to the last named movable lade adapted to resist the action-of said air deflectors when the shutter is rotated.

. 5. A shutter adapted to be mounted upon a shaft consisting of an annular rim, a hub supported from said rim concentrically therewith, a fixed blade carried by said rim, a blade movable about its axis mounted upon said hub, a second axially movable blade carried by said hub and provided with air deflectors, and a tension spring secured to said blade Aand contacting with the firstmentioned movable blade for effecting a movement of the last-mentioned blade relative to the first-mentioned blade.

Inltestimony whereof we affix our signatures.

HARRY F. BURK. GUSTAF W. GUSTAFSON.

rovded with diametri- 

